Flat Mount Block Single Sheave-LG RIGGING®, also known as Flat Mount Pulley Single and a Center Board Pulley Block.
It is a permanently mountable block offering two mounting holes to affix it for static applications.
A flat-mount pulley block is firmly attached to the wall, ceiling or a firm, flat surface to ensure stability in the block itself.
Flat Mount Blocks are made of zinc plated, which offers corrosion resistance and is an excellent finish for both indoor and outdoor use.